EP 4250012 A1 20230927 - TONER AND TWO-COMPONENT DEVELOPER

Title (en)

TONER AND TWO-COMPONENT DEVELOPER

Title (de)

TONER UND ZWEIKOMPONENTENENTWICKLER

Title (fr)

TONER ET RÉVÉLATEUR À DEUX COMPOSANTS

Publication

EP 4250012 A1 20230927 (EN)

Application

EP 23162875 A 20230320

Priority

JP 2022046564 A 20220323
JP 2022204134 A 20221221
JP 2023004801 A 20230117

Abstract (en)

A toner includes a toner particle containing a binder resin containing a crystalline polyester. In differential scanning calorimetry (DSC), the toner is heated to 180°C at a rate of 10°C/min, then cooled to 25°C at a rate of 10°C/min and successively from 25°C to 15°C at a rate of 3°C/min, and heated again to 180°C at a rate of 10°C/min. As a result, an exothermic amount P1 when the toner is cooled from 80°C to 40°C is 1.00 J/g or less, an exothermic amount P2 when the toner is cooled from 25°C to 15°C is 0.10 J/g or more, and when a sum of endothermic amounts P3 (J/g) when the toner is heated again from 40°C to 180°C and a sum of exothermic amounts P4 (J/g) when the toner is cooled from 180°C to 40°C satisfies 2.0 ≤ P3-P4 ≤ 10.0.

IPC 8 full level

G03G 9/087 (2006.01)

CPC (source: EP US)

G03G 9/08755 (2013.01 - EP US); G03G 9/08795 (2013.01 - EP); G03G 9/08797 (2013.01 - EP); G03G 9/107 (2013.01 - US)

Citation (applicant)

JP 2004046095 A 20040212 - RICOH KK
JP 2016033648 A 20160310 - RICOH CO LTD
POLYM. ENG. SCI., vol. 14, no. 2, 1974, pages 147 - 154

Citation (search report)

[A] US 2020183295 A1 20200611 - KANNO ICHIRO [JP], et al
[A] US 2017160660 A1 20170608 - HASEGAWA YUSUKE [JP], et al
[A] EP 2434347 A1 20120328 - FUJI XEROX CO LTD [JP]
[A] US 2017371256 A1 20171228 - SHIRAI AYA [JP], et al
[A] US 2014287353 A1 20140925 - SAKAMOTO SHINYA [JP], et al

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

Designated validation state (EPC)

KH MA MD TN

DOCDB simple family (publication)

EP 4250012 A1 20230927; US 2023341790 A1 20231026

DOCDB simple family (application)

EP 23162875 A 20230320; US 202318182548 A 20230313